First Edition. 8vo, page 524-535, illustrated, graphs; VG; yellow cover with black print, pencil notation upper right, ink notation at bottom "Gift of Prof. R. Daly, 1957", blue library stamp at bottom edge, slight bump to lower corners; back has library stamp at upper edge, slight smudging; interior clean; "Reprinted from The Scientific Monthly, Vol. LI, pp. 524-535 (December), 1940"; "Papers from the Geophysical Laboratory, Carnegie Institution of Washington, No. 1028."
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